Cassandra Clare (Author) Cassandra Clare is the author of the #1 New York Times, USA TODAY, Wall Street Journal, and Publishers Weekly bestselling Mortal Instruments series, The Infernal Devices trilogy, and The Bane Chronicles. Her books have more than 30 million copies in print worldwide and have been translated into more than thirty-five languages. Cassandra lives in western Massachusetts. Visit her at CassandraClare.com. Learn more about the world of the Shadowhunters at Shadowhunters.com.Holly Black (Author) Holly Black is the bestselling author of contemporary fantasy novels for teens and children, including Tithe: A Modern Faerie Tale and the #1 New York Times bestselling Spiderwick series. She has been a finalist for the Mythopoeic Award and the Eisner Award, and the recipient of the Andre Norton Award. Holly lives in Massachusetts with her husband, Theo, in a house with a secret library. Her website is www.blackholly.com.